tado° Smart Thermostat X Starter Kit Review: Which Version, and Is AI Assist Worth It?

The UK wireless starter kit is a box that wires in at the boiler (the Programmer X, with hot-water control and OpenTherm) plus a battery temperature sensor you put on a shelf or wall. It works with most UK boilers, Matter and Thread are built in, and reviewers found it easy to fit. Two things to know before you buy. A slimmer 2nd-generation sensor arrived in September 2026 at £169.99, while the older kit is being cleared at £129–£140. And the feature behind most of tado’s savings figures, automatic geofencing, is in the paid AI Assist plan.

Published 10 October 2026 · Reviews last checked 10 October 2026 · Shopbam summarises other people’s testing; we did not fit or live with this thermostat ourselves.

The three reviews this summary is built from

• Trusted ReviewsEditorial test of the 1st-gen wireless kit on a gas combi, nine tado X devices in all. No reviewer, date or score shown.
• Mighty GadgetSpecialist test by James Smythe, 85%. Published 14 November 2024, updated 21 March 2026.
• tado° UK shop reviews69 reviews on the starter-kit page, split 47 / 19 / 1 / 2 / 0. On the maker’s own shop.

Specification at a glance

Trusted Reviews

Editorial test “Tado X Review: Matter compatible smart heating for all”, tested over a few weeks in November, with no reviewer, date or score shown · trustedreviews.com · the most complete real-home test

Who they are: Trusted Reviews is a UK tech and home review site whose editors use each product and pair that with industry-standard tests in equipped facilities; it says manufacturers don’t vet its reviews and it never takes money to test, so it is a strong hands-on source.

This is the biggest test we found. The reviewer runs nine tado X devices: the wireless starter kit, radiator valves, a second Programmer for underfloor heating and an extra temperature sensor. The boiler is a gas combi that supports OpenTherm, but it was first wired as simple on/off through a Honeywell relay. That is a useful detail, because it shows the kit works either way. Fitting was simple with the app’s instructions, and the radiator valves calibrated themselves.

Thread worked well. The signal reached the whole house and the system was reliable. Getting nine devices into Apple Home took “the best part of an hour”, and there is no Home/Away switch for the whole system in Matter. Two smaller niggles: you cannot name a Programmer in the app, and the sensor only drove one Programmer until a setting was changed. Trusted Reviews thinks AI Assist is worth paying for. It notes that weather adaptation is free but needs an OpenTherm connection. It did not put a figure on savings, saying it was too early. Pros: “Fast to respond”, “Matter compatible”, “Supports boilers and heat pumps”. Verdict: “A proper multi-room heating system for modern-day life.”

🎬 Watch: Tado X Full Review - The Best Smart Heating Solution!

Mighty Gadget

Specialist test “Tado X Review vs Tado V3”, James Smythe, 85%, published 14 November 2024 and updated 21 March 2026 · mightygadget.com · the smart-home angle

Who they are: James Smythe is the editor and owner of Mighty Gadget, the UK tech blog he has run since 2007, with expertise spanning computers and networking — a long-running independent view to set against the bigger review titles.

Smythe moved his downstairs rooms to tado X and kept older tado V3+ upstairs, so he can compare the two. The wireless thermostat went onto his existing wiring in under ten minutes with the power off. No hub was needed, because the boiler unit acts as the Thread border router. Pairing worked first time, which he says was not true of other Thread kit he has tried.

His main reservation is Matter. It got the kit into Home Assistant without trouble, but each device has to be added one at a time and renamed. Only temperature, humidity and thermostat controls come through, and battery levels do not. That is less than the old tado system offered. He puts the subscription at £30 a year for geofencing, open-window detection and flow-temperature tuning. Without it you get a notification and adjust things yourself. His verdict: “superb” for new buyers, but owners of a working V3+ system have little reason to switch.

🎬 Watch: Tado X - Wireless Thermostat and Radiator Valve Unboxing and Setup

tado° UK shop reviews

Retailer ratings 69 reviews on the starter-kit page, split 47 / 19 / 1 / 2 / 0, checked 10 October 2026 · shop.tado.com · on the maker’s own shop

Who they are: tado is the manufacturer, and these reviews sit on its own shop; we could not find how it collects or moderates them, so treat them as unverified customer experience on the seller’s page rather than an independent test.

These reviews sit on the page that sells the kit, and the page does not say whether they come from checked buyers. Treat them as a rough guide. The page shows the split but not the star levels or an average. If the split runs from five stars down to one, that is about 4.6 out of 5. That sum is ours. 66 of 69 reviews are in the top two groups, and 2 are in the second-lowest.

Other shops add little. Screwfix shows 4 out of 5 from one review, and Currys showed no rating for this kit. Be careful with the tado page’s “4.6 stars”, which is the app-store score, not the kit. If you want to see whether tado X suits a bigger house, the comparison below sets it against Honeywell evohome, the usual alternative for room-by-room control.

🎬 Watch: tado° X vs Honeywell Evohome

The savings claim, in plain terms

tado’s UK page says you “save 22% in heating costs on average” and puts that at £244 a year. The footnote shows the £244 is 22% of an average UK gas heating bill of £1,109 (2024). The 22% comes from tado’s own data on its users, not an outside study.

tado also cites a 2022 study it had done by the Fraunhofer Institute for Building Physics. That found savings of up to 28%: up to 23% from geofencing, up to 12% from open-window detection and up to 6% from weather adaptation. tado says these do not simply add up. In 2021 Which? criticised tado for quoting a similar Fraunhofer figure without saying where it came from. tado then added the reference.

Here is the catch. Automatic geofencing and open-window detection are both in AI Assist. On the free plan you get schedules, remote control and a nudge when the app thinks you have left home. You only save if you act on it. So treat 22% as the best case with the subscription, used properly. At £29.99 a year, AI Assist pays for itself if it cuts your gas bill by about 3% of £1,109. That sum is ours. Whether it does depends on how often your house is empty.

Strengths and weak points

Who it actually suits

Buy it if you have a gas boiler or heat pump and want app control and a hot-water schedule, and you are willing to pay £29.99 a year for AI Assist or will act on the app’s reminders yourself. It is a strong choice if you already use Apple Home, Google Home or Home Assistant. It is also a good starting point if you plan to add radiator valves room by room later. The 1st-gen kit at £129–£140 is the better value. The 2nd gen is mainly a nicer, rechargeable sensor.

Look elsewhere if you will not pay a subscription and only want schedules and remote control. The Hive Thermostat Mini and the Nest Learning Thermostat 3rd gen both do that without a subscription. Hive sells an optional Heating Plus plan, but its schedules, boost and location alerts are free. Look elsewhere too if you already have a working tado V3+ system, because the two do not mix. If voice control is the point, an Echo Dot Max can also act as a Thread border router. A Tapo P110 or a Hue starter kit is a cheaper first step into the smart home.

Sources last checked 10 October 2026. Two generations are on sale and prices are moving, so check the box list and the price before you order.